Technics SX-PX107 Manuale utente

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ervice

Manual

ORDER

NO.

EMIDS

1440

-

PCM

Digital

Piano

OX-

PX1

07/PX107M

M),

(MC),

(XM),

(EN), (EH), (EF),

(EZ),

(EW), CEA),

(EP),

{EK),

(XL),

(XR),

(XS),

(XD),

(X),

(XT)

AREAS

f

(Mj):

U.S.A.

(EK}:

the

United

Kingdom

(MC):

Canada

(XL}:

New

Zealand

(XM):

Mexico

(XR):

Australia

(EN):

Norway,

Sweden,

(XS):

Malaysia,

Singapore,

Denmark,

Finland

South

Africa

(EH):

Holland,

Belgium

(XD):

Saudi

Arabia,

Kuwait

(EF):

France,

ltaly

(X):

the

Middle

East,

(EZ):

Germany

Indonesia,

Hong

Kong,

(EW):

Switzerland

the

Philippines,

Photo:

SX-PX107M

(EA):

Austria

Thailand

Spain,

Portugal,

Greece

(XT):

Taiwan

=

Specifications

CABINET

KEYBOARD

SOUNDS

\

(EP):

SX-PX107;

BLACK,

SX-PX107M:

WALNUT

88

KEYS

(MAX.

POLYPHONIC

64

NOTES)

GRAND

PIANO,

UPRIGHT

PIANO,

ROCK

PIANO,

&

PIANO

1,

EP

PIANO

2,

E

GRAND,

HARPSI,

VIBES,

STRINGS,

PIPE

ORGAN

BRILLIANCE

DIGITAL

CELESTE

SOFT,

SOSTENUTO,

SUSTAIN

—

MELLOW,

BRIGHT

(5

STEPS)

DIGITAL

REVERB

TOUCH

SENSITIVITY

TRANSPOSE

METRONOME

SEQUENCER

DISPLAY

DEMO

ROOM,

STAGE,

HALL,

CONCERT

LIGHT,

NORMAL,

HEAVY

G-C-F

©

(TIME

SIGNATURE:

OFF,

2/4,

3/4,

4/4,

5/4,

6/8)

TRACK

(1,

2),

STORAGE

CAPACITY:

APPROX.

4000

NOTES,

RECORDING

MODE:

REAL

TIME

MULTI

TIMBRE,

LOCAL

CONTROL,

OMNI

ON,

PROGRAM

CHANGE,

TRANSPOSE,

PEDAL,

EFFECT

MIDI

MODE

SET

OTHERS

OUTPUT

SPEAKERS

|

POWER

REQUIREMENT

DIMENSIONS

(WxHxD}

NET

WEIGHT

14¢omxz2,

3

PIANO

TUNING,

MINIMUM

RANGE

POWER

SWITCH,

MAIN

VOLUME,

TUNE,

TEMPO,

MIDI

TERMINALS

(IN,

OUT,

THRU},

PEDAL

IN,

LINE

OUT

(R/A+L,

L),

AUX

IN

(A/R+L,

L),

PHONES

x

2,

AC

IN,

INITIAL

KEY

60

Wx

2

t4omx2,

6B5omx2

250

W,

160

W

(NORTH

AMERICA

AND

MEXICO}

AC120/220/240V

50/60

Hz

7

AGI20V

60

Hz

(NORTH

AMERICA

AND

MEXICO)

meee

|

AC230V

50/60

Hz

(NEW

ZEALAND

AND

EUROPE

EXCEPT

FOR

UNITED

KINGDOM)

438.7

om

x

102.4

em

x

50.9

om

(54-19/32"

x

40-5/16"

x

20-

0-1/82")

72.0

kg

{158.7

Ibs.)

ACCESSORIES

AC

CORD,

STAND

*

Specifications

are

subject

ta

change

without

notice

for

further

improvement.

Technics

CONTENTS

M@

PART

I

(INTRODUCTION)

SAFETY

PRECAUTION

............0202.

cece

eeeeee

HOW

TO

ASSEMBLE

THE

PIANO

.........0..0c0eus

KEYBOARD

RANGES

.......2..2.00.

cece

eee eee

eee

OPTIONS

ished

ie

cnieese

each

tah

cbahictbis

ies

weleaten

ARRANGEMENT

OF

CONTROL

PANEL

............-

BASIC

FUNCTIONS

.

200...

cece

cece

e

cece

cece

cece

TERMINALS

...

00...

.c

cece

cee

cece

cence

cece

ecenes

INITIAL

SETTING

0.0.00

cece

cece

eetee

cere

seueeaees

PARTS

LOCATION

..

0...

cccccucecee

ree

enceneesees

DISASSEMBLY

INSTRUCTIONS

..........0.-..00085

SYMPTOMS

WHICH

APPEAR

TO

BE

SIGNS

OF

TROUBLE

Secos

cv

feted

cde

pwotinneGdad

an

oneweeees

ABOUT

THE

SELF-DIAGNOSTIC

FUNCTION

...,.....

MIDI

IMPLEMENTATION

CHART

..............---..

PRECAUTIONS

BEFORE

SERVICING

......-...0008,

PART

H

(SCHEMATIC

DIAGRAM)

BLOCK

DIAGHAM

22264

ss0rdeedwccncetcnrnesitavade

MAIN

&

TONE

GENERATOR

CIRCUIT

BOARD

........

PUR

Se

EE

ee:

MAIN

&

TONE

GENERATOR

CIRCUIT

DIAGRAM

saci

agar

ie

cctees

pete

11-9

AC

POWER

SUPPLY,

AMP

&

POWER

SUPPLY

AND

HEADPHONES

GICUIT

BOARD:

12.50...

cerca

eaerteneres

E-13

AC

POWER

SUPPLY,

AMP

&

POWER

SUPPLY

AND

HEADPHONES

CIRCUIT

DIAGRAM

..........5-

ae

ee

eet

U-17

CONTROL

PANEL

CIRCUIT

DIAGRAM

......

IL-9

CONTROL

PANEL

CIRCUIT

BOARD

........

I-21

-MANUAL

KEYBOARD

1

AND

2

CIRCUIT

cc

oxnnived

eaeuetitint

vote

eerses

IP-24

JACK

CIRCUIT

.atixginesode

catewes

santas

U-27

@

PART

III

(REPLACEMENT

PARTS

LIST)

REPLACEMENT

PARTS

LIST

(P.C.B.

and

Wiring

Parts)

....-..--.

eee

ee

eee

eee

HI-1

CABINET

PARTS

LOCATION

.........-.-...---

0065

I-5

REPLACEMENT

PARTS

LIST

(Cabinet

and

Chassis

Parts}

......-

0...

cae

cece

eae

HI-7

PACKING

.......-------e-

Sad

aleidialsied

o

avbeate

enc

...

HI-10

SAFETY

PRECAUTION

this

“satety

precaution”

is

for

the

U.S.A.

only)

e

Safety

Precaution

oaohon—

.

Before

servicing,

unplug

the

power

cord

te

prevent

an

electric

shock.

.

When

replacing

parts,

use

only

the

manufacturer's

recommended

components

for

safety.

.

Check

the

condition

of

the

power

cord.

Replace

if

wear

or

damage

is

evident.

.

After

servicing,

be

sure

io

restore

the

lead

dress,

insulation

barriers,

insulation

papers,

shields,

etc.

.

Before

returning

the

serviced

equipment

to

the

customer,

be

sure

to

make

the

following

insulation

resistance

test

to

prevent

the

customer

from

being

exposed

to

a

shock

hazard.

e

insulation

Resistance

Test

1.

Unplug

the

power

cord

and

short

the

two

prongs

of

the

plug

with

a

jumper

wire.

2.

Turn

on

the

power

switch.

3.

Measure

the

resistance

value

with

an

ohmmeter

between

the

jumpered

AC

plug

and

each

exposed

metal

cabinet

part,

such

as

screw

heads,

connectors,

control

shafts,

handle

brackets,

etc.

Measurements

should

range

from

4

MQ

to.

infinity

for

all

exposed

parts.

Exposed

metal

part

a

A

Ohmmeter

Resistance=

4MQ

to

oo

HOW

TO

ASSEMBLE

THE

PIANO

*

To

prevent

the

piano

unit

from

falling

off

the

stand,

secure

it

firmly

with

the

screws.

Assemble

the

side

panels

and

the

pedal

box

with

the

4

brass-colored

screws.

Side

panel

Pedal

box

‘Screw

(Brass-colored)

“Fig.

1]

Place

the

stand

upright

and

mount

the.

speaker

box

anto

the

L-shaped

brackets

with

the

6

screws.

(Black

screws

for

model

SX-PX107,

Brown

screws

for

model

SX-PX107M)}

L-shaped

brackeis

[Fig.

2]

[3]

Place

the

piano

unit

on

the

stand

and

secure

it

‘0

the

stand.

(Black

screws

for

model

SX-PX10!,

Brown

screws

for

madel

SX-PX107M)

Connect

the

pedal.

box

cord,

speaker

box

cord

and

power

cord

to

their

sockets

located

rear

of

the

piano

unit

as

shown

below.

Power

cord

Speaker

box'cord

-

Pedal

box

cord

[Fig.

4]

KEYBOARD

RANGES

8

va

a

a

4

.

=

=

Co

as

=

——

os

>...

1

i

+

Middle

1

|

'

'

I !

i

=

!

!

i]

‘

er

om

init

EET

Sheers

u

——

:

=

:

comars

i

=

7

—

_—

1

i]

=

aris

;

' '

:

'

\

Bates

nee

a:

ee

:

'

!

|

!

|

-

i

a

|

ot

P

i

-

(AR)

D¥7

G*i2

C817

FR

22

A*

26

'

Dfa

G*36

aie

Fae

Ats0)

oot

:

'

'

!

'

CMs!

FRO'AS

141

|

D*19-

‘GPa!

Jones

Fig,

(AS

aa!

|

‘D#a3

GP

4p!

'

1

!

:

'

i)

|

|

+

1

|

!

|

!

1

D*ss

G*eo

G65

F*70

Arr4!

D*7g

G¥aa

C8531

F¥sg

Atego!

Der

1G872!

C877!

Faz

:Atee

|

Aa

1

Ca:

'

Gri

Bas

;

‘O18!

Far

1

A251

C2

!

Ea2

1

G36

|

:

B39:

Daa:

Fas

|

Aag::

1

C52

iEs6

1Gs9

+

Bes

|

|

Dee

|

1

Feo

|

A73:

C76

|

Eso

|

Gag

|

Bar

B3

De-

Fa

Ais

Cis

E20

Gis

Ba?

Bas

F33

hy

Ca

Ess

Gar

Bor

Da

Fs?

a

Céa

Eea

Gn

B75

D078

Fer

Ass

Cee

OPTIONS

[PRODUCTS

FOR

SX-PX107-———__

$Z-CP1

$Z-CP3

Bench

.

~

Bench

(PRODUCTS

FOR

SX-PX107M™—

SZ-DC5

|

.

Dust

Cover,

$Z-CP3M

Bench

ARRANGEMENT

OF

CONTROL

PANEL

ESCO

OD

BASIC

FUNCTIONS

@

DEMO

Automatic

demonstration

performances

stored

in

the

‘piano’s

memory

introduce

the

various

sounds.

avail-

MAIN

VOLUME

fe)

SOUND

pre

OEGRAND

OHARPS!

©

VIBES

OSTAINGS

OORGAN

ee

ec

TRANSPOSE

DEMO

MODE

bow

{

ay

SET

3

3)

BRILLIANCE

MELLOW

BRIGHT

°

°

@

SEQUENCER

OTRACK1

~OTRACK?

TOUCK

SENSITIVITY

OLIGHT

ONORMAL

®

DIGITAL

DIGITAL,

CELESTE

REVERB

ROMO

Ona,

«=

METRONOME

°

STIAGEQ

©

OCONCERT

OVOLUME

OnEAvY

OGRANO

OQUPRIGHT

©

ROCK

OEPIANO!

OE

PIANO?

Bre

he,e7s

able.

Listen

to

all

the

demonstration

tunes

in

order,

or

—

listen

to

the

demo

tune

of

a

epecttic

sound,

MODE

SET,

©

INITIAL

key

.

Used

when

selecting

functions

to

set

or

Adinial,

in-

cluding

type

of

piano

tuning,

minimum

range,

initial-

ization,

plus

.all

settable

MIDI

functions.

Also

used

when

erasing

SEQUENCER

tracks.

elf

the

INITIAL

key

is

pressed

while

the

MODE

SET

button

is

depressed,

the

settings

of

the

buttons,

etc.

will

return

to

the

initialized

settings

made

by

the

manufacturer.

TRANSPOSE

:

C

is

the

standard

setting,

but

you

can

raise

or

lower

the

key

of

the

entire

instrument

within

a

one-octave

range

with

these

two

‘buttons,

The

buttons

are

also”

used

for

adjusting

the

volume

‘balance

of

mixed

sounds.

SOUND

Select

from

10

different

sounds

for

the

piano.

You

can

mix

sounds

by

selecting

two

simultaneously.

All

sounds

feature

Touch

Response.

Tune

=

Display

Various

information

is

shown

on

the

display,

includ-

ing

SEQUENCER

information

(remaining

memory

capacity,

error

indication)

and

MIDI

information

(selected

MIDI

CHANNEL,

PROGRAM

CHANGE

number).

TEMPO

Use

to

adjust

the.tempo

and

volume

of

the

metronome

and

the

playback

tempo

of

the

SEQUEN-

CER.

BRILLIANCE

Select

the

brightness

of.the

sound

from

five

settings.

The

setting

is

memorized

independently

for

each

sound.

DIGITAL

CELESTE

Apply

a

celeste

effect

to

give

the

sound

greater

Ss

depth.

The

petting

is

memorized

independently

for

each

sound.

DIGITAL

REVERB

Add

a

reverb

effect

to

the

sound.

Choose

one

of

four

different

echo

types.

The

setting

is

memorized

inde-

pendently

for

each

sound.

@

FAST

ee

(

as

OO

OfRECORD)

ea

METRONOME

You

can

play

in

time

with

a

metronome

sound.

The

metronome

volume

and

speed

are

adjustable,

and

you

can

accent

the

metronome

sound

to

match

the

time

signature

of

the

music.

SEQUENCER

Record

your

performance

and

have

it

automatically

played

back

on

the

two-track

sequencer.

The

memory

capacity

is

about

4000

notes.

TOUCH

SENSITIVITY

Choose

LIGHT,

NORMAL

or

HEAVY

keyboard

touch

(Touch

Response)

to

match

your

type

of

playing.

Sustain

pedal

The

sound

is

sustained

when

a

key

is

released

while

this

pedal

is

depressed.

The

length

of

the

sustain

is

controlled

by

the

degree

to

which

the

pedal

is

depressed

(four

stages).

For

GRAND

PIANO,

UPRIGHT

PIANO

and

ROCK

PIANO

sounds,

the

tones

of

the

17

rightmost

keys

are

automatically

sus-

tained.

®

Sostenuto

pedal

Sustain

is

added

only

to

the

notes

played

while

the

pedal

is

depressed.

®

Soft

pedal

Press

the

pedal

for

softer,

muted

sound.

Se

Sustain

pedal

Sostenuto

pedal

Soft

pedal’

TERMINALS

(On

the

back

of

piano)

mi

Nn

oe

NO

THRU

PEDAL

5000

BQ

e@

00

00

MIDI

(Musical

instrument.Digital

Interface)

MIDI

is

the

standard

specification

that

enables

connec-

tion

to

equipment

such

as

synthesizers

and

personal

computers.

Data

transmission

and

reception

are

pos-

sible

between

the

Technics

Digital

Ensemble

and

in-

struments

provided

with

MIDI

terminals.

LINE

OUT

(output

level

1.5

Vrms,

600

Q)-

of

By

plugging

into

an

external

high-power

amplifier,

the

sound

can

be

reproduced

at

a

high

volume.

Or

connect:

a

tape

recorder

and

use

them

as

recording

terminals...

To

output

monaural

sound;

connect

the

external

equip-

ment

to

the

R/R+L

terminal.

(Do

not

connect

the

L

ter-

minal.)

IN:

The

terminal

that

receives

data

from

external

equipment.

OUT:

The

terminal

that

transmits

data

from

the

AUX

IN

(input

level

0.5

Vrms,

6

kQ)

piano

to

external

equipment.

Other

instruments

such

as

a

rhythm

machine

or

sound

THRU:

The

terminal

that

transfers

data

from

the

IN

module

can

be

connected

to

the

piano

so

that

the

terminal

directly

to

other

equipment.

sound

is

output

from

the

piano.

To

receive

monaural

sound,

connect

the

other

instrument

to

the

R/R+L

ter-

minal.

(Do

not

connect

the

L

terminal.)

eUse

a

5-pin

DIN

cord

(less

than

15m

long)

for

these

connections.

PHONES

(

()

)

x2

For

silent

practice

headphones

may

be

used.

When

PEDAL

IN

plugged

in,

the

speaker

system

is

automatically

Connect

the

cord

from

the

included

stand

to

this

ter-

switched

off,

and

sound

is

heard

only

through

the

minal.

‘i

headphones.

INITIAL

SETTING

The

initial

setting

function

is

used

to

return

to

the

original

factory

settings,

and

to

reset

the

customer

settings

and

misoperations.

The

selected

sound

and

various.

functions,

MIDI

settings

and

SEQUENCER

contents

are

_initil-

alized

with

this

operation.

MODE

INITIAL

SETTING

1

ss

While

pressing

the

Press

the

(_)

MODE

SET

button.

Press

the

INITIAL

key

while

the

MODE

SET

button

is

pressed.

Or

turn

on

the

POWER

switch

while

pressing

the

INITIAL

key.

INITIAL

key.

INITIAL

PARTS

LOCATION

Tone

Generator

P.C.B.

Control

Panel

P.C.B.

Main

P.C.B.

Amp

&

Power

Supply

P.C.B.

Jack

P.C.B.

AC

Power

Supply

P.C.B.

CPO

ae

ep

i

ary,

Speaker

Speaker

6.5cm,

8Q

6.5cm,

8Q

Power

switch

Headphones

P.C.B.

(inside)

Power

Indicator

Soft

re

—

Pedal

Sostenuto

Pedal

[Photo-1]

Speaker

Speaker

140m,

6Q

14cm,

6Q

Pedal

Box

Speaker

Box

[Photo-2]

DISASSEMBLY

INSTRUCTIONS

Removing

the

top

cover

(Fig.

5)

[5]

Removing

the

control

panel

ornamert

1.

Remove

the

top

cover

holding

screws

(@

4

pcs.).

1.

Remove

the

control

panel

(see

step

[3]).

2.

Slide

the

top-cover

forward

and

lift

up.

2.

Remove

the

CP

P.C.B.

(see

step

[4]).

(As

shown

by

the

arrow.)

3.

Release

the

control

panel

ornament

holding

daws.

[2]

Removing

the

keyboard

cover

1.

Remove

the

top

cover

(see

step

[1]).

2.

Close

the

keyboard

cover

completely

so

that

the

gears

at

the

rear

of

the

keyboard

cover

become

free

from

the

guide

rails.

3.

Lift

the

keyboard

cover

up.

[Fig.

5]

[3]

Removing

the

control

panel

(Fig.

6)

1.

Remove

the

keyboard

cover

(see

step

[2)).

2.

Remove

the

contro!

panel

holding

screws

(@

3

pcs.).

3..Remove

the

control

pane!

as

shown

in

Figure

6.

[6]

Removing

the

keyboard

assembly

1.

Remove

the

control

panel

(see

step

[8])..

2.

Remove

the

keyboard

ass’y

holding

screws

lo-

cated

on

the

bottom

of

the

cabinet

(®

10

pcs.).

[4]

Removing

the

P.C.B.

1.

Remove

the

control

panel

(see

step

[3}).

2.

Remove

the

main

volume

knob.

3.

Remove

the

CP

P.C.B.

mounting

screws

(@

6

Keyboard

Assembly

pes.).

wee

volume

knob

Hu

\

if

TAS

[Fig.

8]

Removing

the

speakers

1.

Remove

the

speaker

nets

mounting

screws

(@

4

pes.

each).

2.

Remove

the

14cm

speakers mounting

screws

(@

4

pcs.

each).

eBe

careful

that

the

14cm

speakers

does

not

fall

off,

since

it

comes

free

of

the

speaker

box.

Key(s)

Disassembly

1.

Remove

the

keyboard

assembly

(see

step

[6]).

2.

To

release

the

key

claw.

,

©

Press

the

front

of

the

key

downward

slightly.

@

Press

the

rear

of

the

key

forward

gently.

3.

To

remove

the

key,

lift

as

shown

in

Figure

10.

NOTE:

eThe

key

claw

is

easily

broken.

Do

not

apply

undue

force.

Should

a

key

claw

break,

it

can

still

be

used;

however,

a

replacement

is

recommended.

elf

a

black

key

is

to

be

replaced

it

is

necessary

to

remove

both.

adjacent

white

keys.

[Fig.

10]

Assembly

1.

Insert

the

front

part

of

the

key

into

the

chassis.

2.

Insert

the

plate

spring

into

the

hammer

notch

as

shown

in

Figure

11.

3.

While

slowly

lowering

the

key

into

the

chassis,in-

sert

the

plate

spring

into

the

notch

at

the

rear

of

the

key.

4.

Carefully

insert

the

key

into

the

opening

in

the

chassis

and

slide

the

key

towards

the

rear

to

lock

it

in

place.

Karate

spring

installtion

iQ)

[Fig.

11]

[9]

Removing

the

printed

circuit

boards.

e

Remove

the

top

cover

(see

step

[1]).

TENN

P.C.B.

1.

Disconnect

the

connectors.

Exe

P.c.B.

2.

Remove

the

MAIN

P.C.B.

mounting

screws

(@

2

1.

Release

the

claws

of

the

AC

IN

connector

bracket.

pcs.).

3.

Release

the

claws

of

the

P.C.B.

holders.

HEP.C.B.

1.

Remove

the

keyboard

assembly

(see

step

[6]).

Mell

P.c.B.

2.

Remove

the

headphone

jack

mounting

nuts

@

2

1.

Release

the

claws

of

the

P.C.B.

holders.

pcs.).

3.

Remove

the

HP

P.C.B.

mounting

screw

(@

1

EEGHP.c.B.

pcs.).

1.

Disconnect

the

connectors.

2.

Remove

the

AS

P.C.B.

mounting

screws

(@

2

pcs.).

3.

Release

the

claws

of

the

P.C.B.

holder.

Miter

P.C.B.

1.

Disconnect

the

connectors.

2.

Remove

the

JACK

P.C.B.

mounting

screws

(@

3

pcs.).

3.

Remove

the

jack

panel

mounting

screws

(@

2

pes.).

P.C.B.

P.C.B.

P.C.B.

Mice

P.c.B.

SYMPTOMS

WHICH

APPEAR

TO

BE

SIGNS

OF

TROUBLE

Remedy

eNo

sound

is

produced

if

the

MAIN

VOLUME

is

set

to

MIN.

Use

the

sliding

control

to

set

the

volume

to

an

appropriate

level.

elf

the

MIDI

LOCAL

CONTROL

is

set

to

off,

set

it

to

on.

eThe

metronome,

SEQUENCER

tempo,

etc.

are

indicated

on

the

display.

During

normal

performance,

however,

the

display

is

off.

Phenomenon

No

sound

is

produced

when

the

key-

board

is

played.

Nothing

is

shown

on

the

display.

m

About

the

back-up

memory

The

selected

sound

and

various

functions,

MIDI

while

pressing

the

MODE

SET

button,

press

the

settings

remain

in

the

memory

for

about

1

week

INITIAL

key

on

the

keyboard.

Or

you

can

turn

on

after

the

POWER

is

turned

off.

If

you

wish

to

return

the

POWER

while

pressing

the

INITIAL

key.

all

memories

and

settings

to

their

initialized

status,

ABOUT

THE

SELF-DIAGNOSTIC

FUNCTION

This

model

has

a

self-diagnostic

function.

When

set

to

the

self-diagnostic

mode,

the

quality

can

be

assessed

when

the

diagnostic

procedures

in

the

chart

below

are

followed.

nee

ae

eee

1

MAIN

|

RAM

(IC4),

ROM

(IC3)

check

1.

Connect

the

CHECKING

DEVICE

(refer

to

page

I-12)

to

CN7

on

the

MAIN

PCB,

and

turn

on

the

CHECKING

DEVICE

switch.

2.

Turn

on

the

power

switch.

When.

the

power

switch

is

turned

on,

the

LED

of

the

CHECKING

DEVICE

flashes

on

and

off.

The

first

4

flashes

are

for

the

RAM

check,

and

the

latter

4

flashes

are

for

the

ROM

check.

The

flash

number

corresponds

to

the

RAM

number

and

ROM

number;

since

one

RAM

and

one

ROM

are

used

in

this

model,

flash

1

of

the

first

4

flashes

corresponds

to

the

RAM

(IC4)

check,

and

flash

1

of

the

second

4

flashes

corresponds

to

the

ROM

(IC3)

check.

If

the

part

is

defective,

the

flash

time

for

that

part

be-

comes

longer.

RAM

ROM

2

3

e @

Examples

|

|

2

1.

RAM

OK,

ROM

OK

e

|

2.

RAM

OK,

ROM

defective

e

eo.

8

3.

RAM

defective,

ROM

OK

pa

|

---@---@

an

ae,

e---]

---@

-

Note:

==

indicates

long

flash

time.

RAM

(IC4)

ROM

(IC3)

Gate

array

(IC2)

check

While

pressing

two

C

keys

simultaneously,

turn

on

the

power

switch.

WUT

Ml

MA

Monitor

pins

46~48

(DL6~DL4)

of

IC2

on

an

oscilloscope,

and

check

whether

incremental

data

(see

figure)

is

output.

rie

dena:

OV

3

CP

Gate

array

(IC1)

check

1.

Connect

the

CHECKING

DEVICE

to

CN7

on

the

MAIN

PCB.

(The

Checking

Device

switch

should

be

off.)

2.

While

pressing

two

D

neve

simultaneously,

turn

on

the

power

switch.

URAL

As

D

keys

When

the

power

switch

is

turned

on,

the

LED

of

the

CHECKING

DEVICE

flashes.

The

LED

flashes

4

times,

the

first

flash

corresponding

to

the

IC1

check.

If

IC1

is

defective,

the

first

flash

will

be

longer.

.

IC1

OK

—____

2.

IC1

defective

>

Se

I

---®@

e

e

e

Gate

Array

(1C1)